Passing std::vector items to variadic function

Question

I\'m using gcc 4.6. Assume that there is a vector v of parameters I have to pass to a variadic function f(const char* format, ...).

One approach of doing this is:

Answer 1

Your reflexion is not at the right level of abstraction.

When you say you want to convert the vector to a variable arguments lists, it is because the function that takes the variable argument list does something of interest to you.

The real question is therefore, how could I do the same thing than f, but starting from a vector ?

It is possible than forwarding the call to f might end up begin the solution, but it is not obvious.

If it is just about printing:

void f(std::vector const& vi) {
   bool first = true;
   for (int i: vi) {
     if (first) { first = false; } else { std::cout << ' '; }
     std::cout << i;
   }
}

Or, if you have access to outside libraries:

#include 

void f(std::vector const& vi) {
  std::cout << boost::join(vi, " ");
}

At which point the interest of f is not really evident any longer.